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Because uploads to PyPI are not atomic. They’re now capped within a 14 day window, but it would be extremely confusing to users to have the “release” hash of their dependencies change repeatedly.

(Also: we’d need to determine what it even means to hash a set of files. Do we order by canonicalized filename, by upload time, etc. Each of these has surprising implications!)

Edit: to be clear, it’s not ideal or fully intentional that uploads to PyPI are not atomic. But it’s the status quo and any change will take years.

These things you’re posing as design questions are already solved 1 million times over. If you don’t want to design something new, just use Git semantics. These are not excuses for inaction. Python package management has been a horrifying embarrassment for 15 years and there’s no excuse for the amount it’s been neglected as every other ecosystem has shown better ways.

If it weren’t for AI, Python would have died as a language ecosystem due to their perpetual neglect of this area. The python community clearly had no ability to solve this problem themselves. I got sick and left and started using better tools.

It’s only now that they’re the cornerstone of the world economy that other people are coming in and cleaning up their messes for them. It’s pitiful. Python failed and needed to be saved from itself.